I don't know the details. I don't really know what this is. The color names were written on masking tape, but it became sticky due to aging, leaving marks on the case and the square items. I rewrote the labels with new stickers. I've wiped them down. The tape on the wrapping paper of the colored items has also stained them. I tried wiping the yellow one, but while the marks came off, I didn't want to cause fine scratches, so I stopped. There might be fingerprints on them as well. Thank you. It has a used feel, but there are no noticeable stains. For those who like them, please take them. A set of 8 filters in various colors, each approximately 10cm x 10cm, made of plastic, with a filter frame. - Included: Filter frame? Thank you for looking.